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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Nondestructive method uses powdered iron and eddy current probe to measure the depth/width ratio of cracks in electrically nonconductive materials. The eddy current probe measures the mass of metal in the crack after it has been filled with the powdered iron.
Differential motion equations of probe numerically integrated in rectangular coordinate system for probe ephemeris
Universal probe, which contains a unique frequency discriminator, measures the static and dynamic levels of cryogenic liquids in a hydrogen bubble chamber. The probe allows boiling conditions or other turbulence to be observed throughout all the transition stages.
Probe to bus communication rates for Mars 1971 multiple probe system
Atom probe field ion microscope combining probe hole FIM and mass spectrometer with single particle sensitivity
Ionospheric electron concentration measuring probe techniques compared based on rocket flight data, showing practicability of spherical probe HF capacitance utilization
Fixed-position probes for determination of flow direction in one and two planes are tested over a wide range of Reynolds numbers and Mach numbers. The work is limited to tests of a single probe design for two dimensional flow and a single design for three dimensional flow.
Electronic flaw simulator cycled into the eddy current system eliminates errors in probe calibration. A discrimination level reference established in the probe permits recognition of those flaws in materials with an equivalent volume equal to or greater than the reference.
Lightweight, compact probe structure has low thermal conductance to enable accurate measurement of slight temperature gradients. Probe combines ruggedness, high precision, accuracy, and stability. Device can withstand vibration, shock, acceleration, temperature extremes, and high vacuums, and should interest industrial engineers and geologists.
Probe geometry effects on hot film anemometer probe performance during turbulence measurements in liquids
Redesigned vacuum-probe surface sampler, consisting of wand with disposable probe and filter assembly, collects specimens of fallout and handling contamination.
Current collection characteristics of moving cylindrical and spherical electrostatic probes applied to velocities in earth satellites and planetary probes
Analysis of Jupiter probe space missions and characteristics of probes for completion of mission
Integral electron flux and current in retarding- potential plasma probes, considering application to nonconcave geometry and spacecraft probes
Jupiter atmospheric probe using relay-link communications geometry between probe and flyby spacecraft for 3.5 hr intervals
Metastable atom probe was developed for measuring current density in electron beam as function of two arbitrary coordinates, with spatial resolution better than 0.5 mm. Probe shows effects of space charge, magnetic fields, and other factors which influence electron current density, but operates with such low beam densities that introduced perturbation is very small.
Development of magnetic probe for nondestructive testing of multilayer printed circuit boards to determine existence of opens or shorts is reported. Components of probe are described and procedures for operation are discussed. Two illustrations are provided to show magnetic circuits and principles of operation.
Probe was developed which is capable of recording true stagnation pressure in supersonic and subsonic flows. Static pressure orifices in the compression surface allow probe to be used as combined flow direction and stagnation pressure sensor.